Why subnets have to be different on dual WAN?

[nord_musician]

I configured my 1st router to be 192.168.0.1 and my 2nd router 192.168.0.101. I did this so I can access the web congif page of my 2nd router.

Now I'm getting an IP conflict error on my 1st router (68u) and when I check the dual wan status, the 2nd router has no IP addresses, everything is 0.0.0.0. Everything worked before when they were in different subnets. I just want to be able to access my 2nd router config page for troubleshooting purposes and what not.

So why does router 1 care so much about router 2 being in the same subnet?

 

[RMerlin]

Because this is routing 101. Basic routing requires subnets to not be overlapping, otherwise a router has no way of knowing where it's supposed to send traffic. You have a packet destined to 192.168.1.10. If both interfaces claim to be the valid destinations for anything in the 192.168.1.0/24 subnet, how can the router tell which of the two destination interfaces is the correct one?